The price will be similar to the schemes around the world. And what then - do you have to pay for your own line training? If so - beware. You will find you "fail" the line training and won't have a permanent position because some other young hopeful will be there behind you with the cash and the airline can make more money from them rather than have to pay you to fill the seat.
Also, is this open to people outside Hong Kong? If so. double beware. Without a permanent HK ID card, the airline will have to negotiate with the Labour Department to employ you with such few hours and they will probably say "no".
If applicants are form HK, then why not apply to CX and KA?